DRAM is a staticmemory system that's speedy, reliable and volatile — it loses stored info when there's no power.
DRAM是一种静态内存系统,速度快、可靠而且易损失——在断电后会失去储存的信息。
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In this simple example, we set it as a VM-static singleton, but this is usually not necessary - your application configuration mechanism can determine if you need to use staticmemory or not.